In emails to ServiceDeskPlus We are able to set Category, Sub-Category, Item and Impact   (I haven't checked all fields).

But, Group, Technician and priority we really need to specify to override the values in our email (default) template and we haven't been able to set them in our testing from both a Requester account and my own Admin account.

We are at 9.045 today but should be at 9.105 or higher in a couple of weeks.